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Surface engineering of ZnO electrocatalyst by N doping towards electrochemical CO_(2) reduction

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Journal of Energy Chemistry 2024年第1期88卷 71-81,I0002页

作者： Rohini Subhash Kanase Getasew Mulualem Zewdie Maheswari arunachalam Jyoti Badiger Suzan Abdelfattah Sayed Kwang-Soon Ahn Jun-Seok Ha Uk Sim Hyeyoung Shin Soon Hyung Kang Department of Interdisciplinary program for photonic Engineering Chonnam National UniversityGwangju 61186Republic of Korea Graduate School of Energy Science and Technology(GEST) Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea Department of Chemistry Education and Optoelectronic Convergence Research Center Chonnam National UniversityGwangju 61186Republic of Korea Department of Advanced Chemicals and Engineering Chonnam National UniversityGwangju 61186Republic of Korea School of Chemical Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea Department of Energy Engineering Korea Institute of Energy Technology(KENTECH)Naju 58217Republic of Korea

The discovery of efficient,selective,and stable electrocatalysts can be a key point to produce the largescale chemical fuels via electrochemical CO_(2) reduction(ECR).In this study,an earth-abundant and nontoxic ZnO-based electrocatalyst was developed for use in gas-diffusion electrodes(GDE),and the effect of nitrogen(N)doping on the ECR activity of ZnO electrocatalysts was investigated.Initially,a ZnO nanosheet was prepared via the hydrothermal method,and nitridation was performed at different times to control the N-doping content.With an increase in the N-doping content,the morphological properties of the nanosheet changed significantly,namely,the 2D nanosheets transformed into irregularly shaped nanoparticles.Furthermore,the ECR performance of Zn O electrocatalysts with different N-doping content was assessed in 1.0 M KHCO_(3) electrolyte using a gas-diffusion electrode-based ECR cell.While the ECR activity increased after a small amount of N doping,it decreased for higher N doping content.Among them,the N:ZnO-1 h electrocatalysts showed the best CO selectivity,with a faradaic efficiency(FE_(CO))of 92.7%at-0.73 v vs.reversible hydrogen electrode(RHE),which was greater than that of an undoped Zn O electrocatalyst(FE_(CO)of 63.4%at-0.78 v_(RHE)).Also,the N:ZnO-1 h electrocatalyst exhibited outstanding durability for 16 h,with a partial current density of-92.1 mA cm^(-2).This improvement of N:ZnO-1 h electrocatalyst can be explained by density functional theory calculations,demonstrating that this improvement of N:ZnO-1 h electrocatalyst comes from(ⅰ)the optimized active sites lowering the free energy barrier for the rate-determining step(RDS),and(ⅱ)the modification of electronic structure enhancing the electron transfer rate by N doping.

关键词： ZnO N-doped ZnO Gas-diffusion electrode CO Selectivity Electrochemical CO_(2)reduction

Toward stable photoelectrochemical water splitting using NiOOH coated hierarchical nitrogen-doped ZnO-Si nanowires photoanodes

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Journal of Energy Chemistry 2022年第8期31卷 45-55,I0002页

作者： Indrajit v.Bagal Maheswari arunachalam Ameer Abdullah Aadil Waseem Mandar AKulkarni Soon Hyung Kang Sang-Wan Ryu Department of physics Chonnam National UniversityGwangju 61186Republic of Korea Department of Chemistry Education Chonnam National UniversityGwangju 61186Republic of Korea Optoelectronic Convergence Research Center Chonnam National UniversityGwangju 61186Republic of Korea

photoelectrochemical(pEC)water splitting is regarded as the most promising method to generate“green hydrogen”,and zinc oxide(ZnO)has been identified as one of the promising candidates for pEC water splitting owing to its straddling band alignment with the water redox level.However,its pEC performance is limited due to its wide bandgap and anticipated by photocorrosion in an aqueous medium.In this work,we present strategic improvements in the pEC water splitting performance of ZnO nanowires(NWs)by nitrogen(N)-doping along with photostability by the core–shell deposition of a NiOOH cocatalyst.Highly crystalline hierarchical ZnO NWs were fabricated on Si NWs(ZnO-Si HNWs)using a metal organic chemical vapor deposition approach.The NWs were then N-doped by annealing in an NH_(3) atmosphere.The N-doped ZnO-Si HNWs(N:ZnO-Si HNWs)showed enhanced visible light absorption,and suppressed recombination of the photogenerated carriers.As compared to ZnO-Si HNWs(0.045 m A cm^(-2) at 1.23 v vs RHE),the N:ZnO-Si HNWs(0.34 m A cm^(-2) at 1.23 v vs RHE)annealed in NH^(3) ambient for 3 h at 600℃showed 7.5-fold enhancement in the photocurrent density.NiOOH-deposited N:ZnO-Si HNW photoanodes with a photostability of 82.21%over 20000 s showed 10.69-fold higher photocurrent density(0.48 m A cm^(-2) at 1.23 v vs RHE)than ZnO-Si HNWs.

关键词： Hierarchical NWs MOCvD NiOOH cocatalyst N-doping photoelectrochemical water splitting

Adriamycin-induced cardiomyopathy can serve as a model for diabetic cardiomyopathy ——a hypothesis

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Asian pacific Journal of Tropical Biomedicine 2017年第11期7卷 1041-1045页

作者： Kaviyarasi Renu v.G.Abilash p.B.Tirupathi pichiah Thabassum Akthar Syeda Sankarganesh arunachalam School of Biosciences and Technology VIT University Department of Animal Science School of Life Sciences Bharathidasan University Department of Biotechnology Kalasalingam University

Diabetic cardiomyopathy is one of the life threatening complications of diabetes. A number of animal models are being used for studying diabetic cardiomyopathy. In laboratory animal models, induction of cardiomyopathy happens in two stages: first being the induction of diabetic condition and the second being the induction of cardiomyopathy by prolonging diabetic condition. It takes a longer time to develop diabetes with the limited success rate for development of cardiomyopathy. Adriamycin is an effective anticancer drug limited by its major side-effect cardiomyopathy. A number of features of Adriamycin treatment mimics diabetes. We postulate that Adriamycin-induced cardiomyopathy might be used as a model system to study diabetic cardiomyopathy in rodents since a number of features of both the cardiomyopathies overlap. Left ventricular hypertrophy, systolic and diastolic dysfunction, myofibrillar loss, and fibrosis are hallmarks of both of the cardiomyopathies. At the molecular level, calcium signaling, endoplasmic reticulum stress, advance glycation endproduct activation, mitochondrial dysfunction,inflammation, lipotoxicity and oxidative stress are similar in both the cardiomyopathies.The signature profile of both the cardiomyopathies shares commonalities. In conclusion,we suggest that Adriamycin induced cardiomyopathic animal model can be used for studying diabetic cardiomyopathy and would save time for researchers working on cardiomyopathy developed in rodent using the traditional method.

关键词： Cardiomyopathy Diabetes Animal model for cardiomyopathy Adriamycin Diabetic cardiomyopathy

Dielectric and Optical Characterization of Boron Doped Ammonium Dihydrogen phosphate

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Journal of Crystallization process and Technology 2013年第1期3卷 5-11页

作者： Delci Zion Shyamala Devarajan Thayumanavan arunachalam Department of physics A.V.V.M. Sri Pushpam College Thanjavur India. Department of physics D.G.Vaishnav College Chennai India

Single crystals of pure and boron doped ammonium dihydrogen phosphate were grown from aqueous solution by slow solvent evaporation process. ICp studies were done to confirm the presence of the dopant boron in the parent crystal. The values of the lattice parameters were determined by single crystal X-ray diffraction. The pure and doped ADp crystals were found to have tetragonal structure. Complete optical characterizations of the crystals were done using the FTIR, Uv-vis and NLO studies. The presences of the various functional groups in the crystals were identified by FTIR spectrum. The band gap energies of the pure and doped crystals have been calculated at their cut off frequencies using the Uv-vis spectrum. The second harmonic generation efficiency of the crystals was determined. The electric properties of the grown crystal have been analyzed by studying the variation of dielectric constant and dielectric loss with frequency.

关键词： Solution Growth ADp Boric Acid Optical Transparency NLO Dielectric Constant

Wind Motions around the Tropical Cirrus Using Simultaneous Radar and Lidar Observations over Gadanki (13.45°N, 79.18°E), India

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International Journal of Geosciences 2014年第11期5卷 1241-1253页

作者： C. Dhananjaya Rao M. arunachalam Srinivasan M. Krishnaiah Y. Bhavani Kumar S. v. B. Rao Department of physics Sri Venkateswara University Tirupati India Seshachala Institute of Technology Puttur India National Atmospheric Research Laboratory (NARL) Gadanki India

The present study describes variation of peak linear depolarization ratio (LDR) with wind around the cloud altitude using simultaneous observation of winds and cirrus cloud for the first time using Indian MST radar and polarization lidar co-located over a low latitude station Gadanki (13.7°N and 79.2°E). Three different cases of passage of the cirrus at different altitudes are noticed, one during a North-East monsoon day and other two during South-West monsoon days. The zonal wind below the cloud height has shown similar variation with LDR during 02 November 2006 and the meridional wind within the cloud height during 25 July 2007 and 08 June 2006 has shown opposite variation with LDR. Even though there is a significant increase in zonal wind due to the existence of tropical easterly jet (TEJ) above cloud height during 25 July 2007 and 08 June 2006, also, the vertical wind is found to be continuously varying during 25 July 2007 and it is upward dominant in the initial stage and is mostly downward in the later stage of observation on 08 June 2006, there is a slight descent in cloud altitude only during 25 July 2007. Thus, the wind above the cloud height alone may not affect the ascent/descent of the cloud top altitude. The potential temperature gradient is high within the cloud heights when the cirrus present near the cold point tropopause indicates the maximum air-mass mixing near the tropopause.

关键词： Cirrus Cloud LDR Winds TEJ Lidar Radar

产生白细胞介素23的经典树突状细胞控制脑卒中时有害的白细胞介素17反应

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中华高血压杂志 2018年第1期26卷 60-60页

作者：黄洁叶鹏 Gelderblom M Gallizioli M Ludewig p Thom v arunachalam p Rissiek B Bernreuther C Glatzel M Korn T Arumugam Tv Sedlacik J Gerloff C Tolosa E planas AM Magnus T

炎症可促进缺血性组织损伤并恶化脑卒中患者的临床结局。αβ和γδT细胞都是已经明确的脑卒中组织损伤介导因子,而树突状细胞（dendritic cells,DC）对脑卒中早期T细胞激活和脑卒中发生的作用仍不清楚。方法：在实验性脑卒中小鼠模型中... 详细信息

炎症可促进缺血性组织损伤并恶化脑卒中患者的临床结局。αβ和γδT细胞都是已经明确的脑卒中组织损伤介导因子,而树突状细胞（dendritic cells,DC）对脑卒中早期T细胞激活和脑卒中发生的作用仍不清楚。方法：在实验性脑卒中小鼠模型中,研究者通过流式细胞分析根据细胞表面标志物、发育标志物表达以及细胞因子水平确定浸润DC亚群的免疫表型。

关键词：脑卒中白细胞介素